Alarm press-button contact.



v.1; 0. T. GLORIUS. ALARM PRESS BUTTON CONTACT. APPLICATION PILB D APE-8, 1913.

Patented May 5, 1914 UNITED STATES PATENT orrion.

AXEL VALDEMAR CLORIUS AND ODIN THORVALD CLORIUS, OF COPENHAGEN,

DENMARK.

Specification of Letters Patent.

Patented May 5, 1914.

' Application filed April a, 1913. Serial No. 759,097.

To all whom may concern:

Be it known that we, Axnr. VALDEMAR CLoiuus, manager, and ODIN THORVALD Creams, manager, both of No, 17 Niel-s Ebbesensvej, Copenhagen, in the Kingdom of Denmark, have invented certain new and useful Improvements in Alarm Press-Button Contacts; and we do hereby declare the following to be a full, clear, and exact de-' scription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and'to letters or figures of reference marked thereon, which form a part of this specification.

The object of the present invention is to provide an arrangement by means of which the puslrbutton contact of an electric bell ringing circuit may be simultaneously used as a fire-alarm contact.

Through this invention the mounting and connection of electric fire alarm arrangements are simplified to such a degree, that they can be used at a very small expense in bedrooms, sickrooms, sitting-rooms, nurseries and the like.

In existing bell ringing circuits the usual push-button contacts can be easily replaced by the aforesaid combined fire-alarm and push-button contact, as the latter is of the same size and appearance as those now in use, it consequently not being necessary to alter or break the old circuit. As regards new bell ringing circuits these may from the verybeginning be providedwith the said combined contacts, which resemble the ordinary contacts both as regards appearance and size.

In the accompanying drawing Figure 1 is a central vertical section of one form of device embodying the invention, Fig. 2 is a central vertical section of a modified construction, and Fig. 3 is a like view of an other form of the device.

In the form of construction shown in Fig. 1 the support 0 of insulating material 1s provided in the center with a cvlindrical depression P upon the bottom of which rests a spiral s ringQ, said spring passin up in the thimb shaped metal iston R an pressing the latter against t e fusibleplug E servingas distance piece and placed inside the push-button S, said push-button consisting likewise of metal and being guided contact with the two plates T and Illarrd,

in the cover B which with the support 0 constitutes a casing for the parts. The contact plate T to which is connected the one conducting wire H and the contact plate U to whlch is connected the other conducting wire K are in this case flat metal strips screwed on to the support 0 and artly proecting over the depression P. pon pressng the push-button S the spiral spring Q Is compressed and the push-button S,which at its lower end is rovided with a sufficiently broad flange will thus touch both contact plates T and U whereby'the circuit is closed. When in case of fire the plug E melts, the spiral spring Q, presses the piston R upward, whereby the. flange W at the lower end of the piston IR, will come into I thus close the circuit. In this form of con? struction tli-e fusibleplug E, which sho'uldfl as a rule melt at a temperature of about 10 C. and accordinglymust consist of 'stearin or similar substance that is comparatively soft at the ordinary room temperature, can only be subjected to the pre-determined pressure exerted by the spiral spring Q, and never to the incalculable pressure on the push-button. Furthermore, in'this construe-,3 tion the fusible plug is removed as farasi possible from the contact plates used for the;

re-alarm, so that the melting stearin cam. not soil same and thus at the decisive mo-g, inent prevent a metallic contact. This soil ing is furthermore prevented partly thereby that the lower surfaces of the contact plates T aid U are used for the fire-alarm and partly that the flange \V on the piston R is bowl-shaped and provided with holes. When the cover B is removed, for instance for connecting the push-contact. to the ringing circuit and for fastening the contact to the wall or for renewing the melting plug E, the projecting contact plates and U will prevent the piston R and the is pira'l' sprin Q from falling out or getting displace This is of importance as this work is nerally carried out. by unskilled hands.

Fri the modification illustrated in Fig. 2, one of the contact plates indicated by T is made flexible and formed so that its free end bears upon the bottom of the piston R which as indicated has a solid body portion. The spiral sprin Q shown in Fig. 1 is dispensed with. en using the device as an ordinary push-button the button S with the piston D is pushed in until its flange V env gages that portion of the spring contact plate T which lies in its path and the extended portion of the contact-plate U thus closing the circuit. Then in case of fireand the plug E melts, the spring contact-plate T will push the piston R outward and a laterally projecting flange 7' formed on the inner end of the piston will be engaged by the contact late U and close the circuit.

In the modification illustrated in Fig. 3 the spiral spring Q has a portion as T which conforms to depression P of the support 0 and is connected to the conductor H, thereby dispensing with the contact plate T.

It will furthermore be seen that in the combined press-button and firealarm contacts as described above the current is unavoidably closed when the cover 13 is re moved. This is of importance should any body attempt to put the fire-alarm-out of operation in case of arson. In case the melting plug consists of stearin it is provided that the diameter of same corresponds to that of the standard stearin candles on the market.

In the forms of construction shown the melting plug used as distance piece is placed in the outward projecting press-button,

whereby the radiating heat from an outbreak of fire will easily affect it.

We claim:

1. In a push-button contact, a hollow push-button, a readily fusible body in the cavity of the button, a piston normally held against said body, a contact on the button, a contact on the piston, a fixed contact between the movable contacts, and a second contact arranged to cooperate with the fixed contact to close the circuit.

2. In a push-button contact, a casin a hollow puslrbutton mounted therein, a raid- AXEL VALDEMAR oLoniUs. ODIN THORVALD oLoniUs.

Witnesses P. 'HOFMAN-BANG, ERNEST BoUTAno. 

